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21185025069 = 313543205771
BaseRepresentation
bin10011101110101110…
…011101010000101101
32000200102100210001010
4103232232131100231
5321341331300234
613422100335433
71346661512325
oct235656352055
960612323033
1021185025069
118a9143798a
1241329a4579
131cc8057cc0
14104d838285
1583ece96e9
hex4eeb9d42d

21185025069 has 8 divisors (see below), whose sum is σ = 30419523232. Its totient is φ = 13036938480.

The previous prime is 21185025053. The next prime is 21185025083. The reversal of 21185025069 is 96052058112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21185025069 - 24 = 21185025053 is a prime.

It is a super-2 number, since 2×211850250692 (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 543205771 = 21185025069 / (2 + 1 + 1 + 8 + 5 + 0 + 2 + 5 + 0 + 6 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21185025019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271602847 + ... + 271602924.

It is an arithmetic number, because the mean of its divisors is an integer number (3802440404).

Almost surely, 221185025069 is an apocalyptic number.

It is an amenable number.

21185025069 is a deficient number, since it is larger than the sum of its proper divisors (9234498163).

21185025069 is a wasteful number, since it uses less digits than its factorization.

21185025069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543205787.

The product of its (nonzero) digits is 43200, while the sum is 39.

The spelling of 21185025069 in words is "twenty-one billion, one hundred eighty-five million, twenty-five thousand, sixty-nine".

Divisors: 1 3 13 39 543205771 1629617313 7061675023 21185025069